Article ID: CBB784542822

Watt’s in a name? Units of power and energy (2019)

unapi

The origins and adoption of the units of power and energy watt and joule are examined, along with their relationships to the achievements of their namesakes, James Watt and James Prescott Joule. The watt and joule came about as part of a group of practical electrical units named and defined in the second half of the nineteenth century. The development of that system and its relationship to the French revolutionary metric system and the current Système International (SI) is outlined. William Thomson (later Lord Kelvin) and the Siemens brothers had important parts in the story; their roles and the units names after them are also described.

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Authors & Contributors
J. E. Wolff
Miguel Ohnesorge
Jackson, Rebecca L.
Epstein, Jessica
Schlaudt, Oliver
Jayson, Joel S.
Journals
Studies in History and Philosophy of Science
Physis: Rivista Internazionale di Storia della Scienza
Notes and Records: The Royal Society Journal of the History of Science
Science and Education
Revue d'Histoire des Sciences
Perspectives on Science
Publishers
Pickering & Chatto
Oxford University Press
Concepts
Measurement
Standards and standardization
Physics
Thermodynamics
Metric system
Conservation of energy (physical concept)
People
Kelvin, William Thomson, Baron
Joule, James Prescott
Mayer, Julius Robert von
Hertz, Heinrich Rudolph
Gauss, Carl Friedrich
Helmholtz, Hermann Ludwig Ferdinand von
Time Periods
19th century
21st century
20th century, late
20th century
20th century, early
18th century
Places
Polar regions
Germany
British Isles
Institutions
Convention du mètre (1875)
Royal Society (Great Britain). European Science Exchange Programme
International Bureau of Weights and Measures
British Association for the Advancement of Science
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